Drawing device for textile machines

ABSTRACT

THE HOUSING ARM OF A DRAWING DEVICE IS MANUALLY OPERATED SO THAT A PRESSURE MEMBER THEREON ENGAGES A CAMMING SURFACE OF A PRESSER ARM AND MOVES THE SAME WITH THE TOP ROLLERS TO AN OPERATIVE POSITION IN WHICH THE PRESSER ARM IS LOCKED BY THE PRESSURE MEMBER ENGAGING AN ARRESTING RECESS AT THE END OF THE CAMMING SURFACE OF THE PRESSER ARM.

Oct. 5, 1971 HQHLQCH 3,609,820

DRAWING DEVICE FOR TEXTILE MACHINES Filed Dec. 9. 1968 2 Sheets-Sheet lInventor.-

Oct. 5, 1971 K. HOHLOCH 3,609,820

DRAWING DEVICE FOR TEXTILE MACHINES Filed Dec. 9, 1968 2 Sheets-Sheet 2Inventor:

kuer HUI/40 b Fl 6.50 '3 ma e m1 United States Patent Ofice 3,609,820Patented Oct. 5., 1971 US. Cl. 19-267 29 Claims ABSTRACT OF THEDISCLOSURE The housing arm of a drawing device is manually operated sothat a pressure member thereon engages a camming surface of a presserarm and moves the same with the top rollers to an operative position inwhich the presser arm is locked by the pressure member engaging anarresting recess at the end of the camming surface of the presser arm.

BACKGROUND OF THE INVENTION The present invention relates to drawingdevices or drafting devices for textile machines, such as spinningmachines or twisting machines of the type in which bottom rollers aremounted on supporting means, and cooperate with top rollers,respectively, mounted on a presser or weighing arm having a housing.

The pressures acting on the top rollers engaging the bottom rollers arefrequently very high in drawing devices. Therefore, great force isrequired to move the presser arm into the operative position. In anapparatus according to the prior art, an actuating lever is provided inaddition to the presser arm and to the housing of the same whichprojects from the top of the housing and, 'when depressed, moves thepresser arm to the operative position. This device is complicated andhas the disadvantage that the operating lever projects in the openposition of the housing an angle of 50 in upward direction, while thehousing is displaced only at an angle of about 38 so that the operat inglever projects high above the housing requiring mounting of a gratinghigh above the drawing device so that the operation of the respectivespinning machine is rendered difiicult, and the height of the machineryincreased.

Another arrangement according to the prior art is known in which thepresser arm is directly operated and displaced to the operativeposition, which requires the application of very great force by theoperator so that at high top roller pressures, a manual operationbecomes impossible.

SUMMARY OF THE INVENTION It is one object of the invention to provide adrawing device which is free of the disadvantages of the prior art, canbe operated by application of a comparatively small manual force, and isof compact construction.

Another object of the invention is to provide a drawing device which canbe manually operated with one hand, but nevertheless produces very greatpressures between the top and bottom rollers.

With these objects in view, the present invention provides a drawingdevice in which a pivotally mounted housing arm is used for actuatingthe presser arm carrying the top rollers. Force transmitting means areprovided between the housing arm and the presser arm, and reduce theforce required for operating the presser arm with the top rollers. Whenthe housing arm has placed the presser arm in the operative position inwhich the top rollers cooperate with the bottom rollers, both arms arearrested.

Due to the fact that the housing arm is used for operating the presserarm, the housing arm requires little height when turned upward to theinoperative position, so that a low grating can be provided. A turningof the housing arm between its inoperative and actuating positionsrequires only an angle ofabout 35 Due to the omission of an additionaloperating lever, the apparatus is simple, and the cleaning of theapparatus is facilitated. It is also possible to provide the housing armwith a completely smooth outer surface so that no airborne impuritiesare deposited thereon. The ratio of the force transmitting means isselected so that comparatively little force is required for moving thehousing arm to an actuating position in which the presser arm is in itsoperative position and the top rollers cooperate with the bottomrollers.

The construction of the invention makes it possible to provide springscausing the presser arm to follow the movement of the housing arm to theinoperative position, so that complicated couplings required in theprior art can be omitted.

The locking of the presser arm in its operative position by the housingarm in its actuating position is not effected by a manually releasedspring biassed latch, but by the cooperation of apart of the forcetransmitting means with an arresting recess. In accordance with theinvention, the arrangement is such that the turning of the housing armeffects locking of the presser arm in its operative position when thehousing arm is moved to the actuating position, while movement of thehousing arm out of the actuating position, effects release of thepresser arm. The interlocking of the presser arm and housing armrequires the mounting of the presser arm and housing arm for turningmovement about spaced pivot axes.

In the preferred embodiment of the invention, the presser arm or housingarm is provided with an arresting recess, and the respective other armis provided with a member which engages the recess when the presser armis in the operative position, the arrangement being such that thepressure between the top and bottom rollers holds the member in thearresting recess so that the presser arm must be moved a short distancebeyond its operative position for releasing both arms for movement tothe inoperative position.

A corresponding movement is required for moving the arresting memberinto the recess. In this manner, the safety of the arresting and lockingof the arms increases with an increased operating pressure between thetop and bottom rollers so that the arms cannot accidentally unlock,irrespective of the operating pressure.

When the housing arm is turned upwardly to its inoperative position,little force is required for moving the arresting member out of thearresting recess whereby the arms are unlocked. This type of arrestingcan be obtained without difficulty by a suitable arrangement andposition of the pivot means supporting the presser arm and the housingarm, together with a suitable shape of the arresting recess andarresting member.

The force transmitting means between the housing arm and the presser armcan be constructed in different ways, as long as the manual force isreduced to a desired degree. It would be possible, for example, toprovide a force transmitting lever system, and it would also be possibleto make the force transmitting means effective only in the region of theoperative position of the presser arm, but it is preferred to provide apressure member on one arm cooperating with a camming surface or edge onthe other arm. Preferably, the camming surface has a track located in aplane parallel to the drawing direction and intersecting the drawingplane defined by the rollers at right angles.

Preferably, the pressure member is mounted on the housing arm, and thecamming surface provided along an edge of the presser arm. It isadvantageous to mount the pressure member for turning movement so thatthe smooth transmission of force is assured even at high operatingpressures. Combined with spring biassed top rollers, the above explainedconstruction of the force transmitting means permits a very easyadjustment or setting of the pressure exerted by the top rollers on thebottom rollers if the position of the pressure member can be adjusted.In the preferred construction of the present invention, the pressuremember is annular and mounted on an eccentric adjusting member whoseangular position can be manually adjusted.

In drawing devices according to the prior art, each of the top rollersis mounted not only for rotation, but also for tilting movement in orderto obtain an automatic alignment of the top rollers with the respectivebottom rollers in a position in which the axes of the same are parallel.However, it has been found that an apparatus of the prior art, analignment of the top and bottom rollers with parallel axes cannot beobtained for the top rollers which are forwardly located, particularlyfor the top rollers where the roving or sliver enters.

In order to eliminate this disadvantage, the present invention providesa presser arm which is mounted for tilting movement about an axis whichis, in the operative position of the presser arm, perpendicular to thedrawing plane, and located before the bearings of the top rollers in thedrawing direction. As a result, the rapidly rotating top roller ofdrawing device, which always assumes a position in which its axis isparallel to the axis of the cooperating bottom roller acts on thepresser arm to tilt the same to a position in which the other toprollers carried by the presser arm are in operative positions in whichthe axes thereof are exactly parallel to the respective cooperatingbottom rollers. In this manner, the drawing function of the drawingdevice is improved.

The presser arm is preferably mounted for tilting movement about itslongitudinal axis in order to obtain pressing of the top rollers alongthe length thereof against the respective bottom rollers.

When the force transmitting means include a pressure member and acamming surface, the pressure member is mounted, preferably by means ofa needle bearing, movable in a direction parallel to the pivot axis ofthe housing arm so that a tilting of the presser arm is not obstructed.

In another preferred embodiment of the invention, the pressure member istiltably mounted on a self-aligning roller bearing so that the pressuremember does not obstruct tilting movements of the presser arm. Theselfaligning roller bearing is advantageously used for supporting anannular pressure member so that the same rolls on the camming surface.

One embodiment of the invention comprises supporting means includingfirst bearing means for the bottom rollers; a presser arm mounted on thesupporting means for movement between an inoperative position and atleast one operative position, and including second bearing means inwhich top rollers are mounted; a manually operated housing arm mountedon the supporting means for movement between an inoperative position andat least one actuating position; and force transmitting means connectingthe housing arm with the presser arm so that the latter moves to theoperative position when the housing arm is moved to the actuatingposition.

The force transmitting means preferably include a pressure membermounted on the housing arm, and a camming surface of the presser arm,the camming surface being arranged in such a manner that the manualforce applied to the housing arm is less than the force transmitted bythe same to the presser arm. In the preferred embodiment, the forcetransmitting means are also used for locking the presser arm and housingarm in the operative and actuating positions respectively. An arrestingrecess is provided in the presser arm at the end of the camming surface,and when the presser arm is in the operative position and the housingarm is in the actuating position, the pressure member engages thearresting recess which has such a shape that the housing arm and presserarm are locked to each other and hold the top rollers, which are springbiassed, in a position cooperating with the respective bottom rollers.

The housing arm is preferably mounted on a stationary shaft for angularmovement between inoperative and actuating positions, a mounting bracketis fixedly secured to the same shaft and carries a pivot means formounting the presser arm for angular movement between inoperative andoperative positions.

The pressure member is preferably annular and mounted on an eccentricadjusting member which can be manually adjusted to vary the pressurebetween the top and bottom rollers.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims. Theinvention itself, however, both as to its construction and its method ofoperation, together with additional objects and advantages thereof, willbe best understood from the following description of specificembodiments when read in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a side elevation, partiallyin section, illustrating a drawing device according to the invention inthe operative drawing position;

FIG. 2 is a side elevation, partially in section, illustrating thedrawing device in a partly opened position;

FIG. 3 is a side elevation, partially in section, illustrating thedrawing device in a fully opened position;

FIG. 4 is a cross-sectional view taken on line 44 in FIG. 1;

FIG. 5 is a fragmentary sectional view illustrating the eccentricmounting of a pressure member used in the embodiment of FIGS. 1 to 4;and

FIG. 5a is a fragmentary front view illustrating a selfaligning ballbearing used in a modified embodiment.

DESCRIPTION OF THE PREFERRED- EMBODIMENTS Referring now to the drawing,the drawing device is mounted on supporting means 1 including bearingmeans 2 for bottom rollers 3. A carrier structure 4 for top rollers 29is mounted on a stationary support shaft 5 whose axis is parallel to theaxes of the bottom rollers. Support shaft 5 is mounted on the supportingmeans of a spinning machine, not illustrated, which may be a ringspinning machine. Supporting means 1 may also be fixed to the supportingmeans of the spinning machine and forms with the same, support shaft 5and a bracket 11 a stationary supporting structure.

The carrier 4 comprises a housing arm 7, and a presser arm 9 withlongitudinally adjustable bearing means 10. The supporting bracket 11 issecured by screws 6 to the stationary support shaft 5, and located in aU-shaped portion 12 of housing arm 7 which has sleeve portions 13surrounding support shaft and mounting housing arm 7 for angularmovement about the axis of stationary support shaft 5 between thepositions illustrated in FIGS. 1 to 3. An eccentric adjusting member 14has a shaft 14 mounted on a U-shaped housing portion 12 of housing arm 7for turning movement and having a shaft portion 14a projecting fromhousing portion 12 and carrying a manually operable member 15 by whicheccentric adjusting member 14 can be turned between adjusting positionsindicated by indicia 40 on the outer surface of housing arm portion 12,as shown in FIG. 2. As best seen in FIG. 5, a needle bearing 16surrounds the eccentrically mounted but cylindrical eccentric adjustingmember 14 and has an outer race constituting an annular pressure member17 cooperating with a camming surface 31 on the upper edge of presserarm 9 which is mounted for angular movement in the direction of thedouble arrow A shown in FIG. 3, on a pivot pin 21 fixedly supported inparallel arms 20 of the stationary support bracket 11. The pivotalmounting of presser arm 9 on pivot pin 21 is accomplished in such amanner that presser arm 9 can also perform tilting movements in thedirection of the double arrow B, and angular movements in the directionof the double arrow C, shown in FIG. 4. In the illustrated embodiment,pivot pin 21 is fixed to the fork arms 20 of the stationary supportbracket 11, and passes with play through a corresponding opening inpresser arm 9. The diameter of this bearing opening increases from thecenter of presser arm to the lateral surfaces of the same. Pivot means21 has a centrally located circumferential groove 19 engaged by aprojection 19a on the wall around the bearing opening in presser arm 9.Due to the fact that support bracket 11 with arms 20, and pivot 21 arelocated within the housing portion 12 of housing arm 7, they areprotected from dust and airborne lint. As shown in FIG. 1, the entirepresser arm 9 is located within the housing arm in the operative drawingposition.

Since presser arm means 9 cannot only turn in the direction of thearrows A, but also tilt in the direction of the arrows B and oscillatein the direction of doublearrow C about an axis perpendicular to thedrafting plane of the drawing device, the camming surface 31 movestransversely relative to the pressure member 17 which is mounted on thehousing arm 12 which, due to its mounting on support shaft 5, cannotperform lateral or tilting movements. Therefore, the needle bearing 16is preferably replaced by a self-aligning roller bearing, as shown inFIG. 5a, so that presser arm 9 can be tilted and laterally displacedwhile its camming surface 31 abuts the annular pressure member 17. FIG.5a shows eccentric member 14 surrounded by a self-aligning ball bearing16 having an inner ring 16a secured to eccentric member 14, and an outerring 16b which is mounted for limited movement in the directionsindicated by double-arrow C parallel to the axis of eccentric member 14.If necessary, the needles of needle bearing 16 may be barrel-shaped sothat the needle bearing functions in the manner of a self-aligningroller bearing, or each needle may be replaced by several balls. In anyevent, the needle bearing is constructed to permit transverse or lateraloscillating movements of presser arm 9 which are caused by the automaticadjustment of the position of the top rollers 29 which are twin rollerstending to assume a position in which the axis thereof is parallel tothe axis of the respective pair of twin bottom rollers 3.

Presser arm 9 has a guide rail portion 22 on which a plurality ofbearing means for top rollers 29 is mounted. Each bearing means 10 has acasing 23 which can be secured by a screw 24 to guide rail 22 in aposition adjusted along the length of guide rail 22. A slide block 25,see FIG. 2, is mounted in casing 23 for transverse movement in thedrection of the double arrow D, see FIG. 1, and each slide block 25 hasa bearing seat 26 rollers 29 is mounted. On both sides of guide rail 22,in which the central portion 27 between the twin top springs 30 areprovided in casing 23 which abut the end Wall of the casing and slideblock 25 to urge the latter out of the casing to an end position limitedby a stop. Slide block 25 has a guideway for guide rail 22, whose crosssection is rectangular, so that the slide block 25 and the bearing seat26 cannot tilt relative to guide rail 22.

When carrier 4 for the top rollers 29 is in the drawing position shownin FIG. I, slide blocks 25 are urged into casings 23 against the actionof springs 30 so that the top rollers 29 exert pressure on the bottomrollers 3.

As noted above, the camming surface 31 of presser arm 9 cooperates withpressure member 17, and when housing arm 7 is moved from the fully openposition of FIG. 3 to the operative drawing position shown in FIG. 1,pressure member 17 moves along a circular path hav ing its center in theaxis of shaft 5 about which housing arm 7 turns. Since camming surface31 deviates from this circular path, force is transmitted from pressuremember 17 to presser arm 9, and the same is turned about pivot means 19toward the bottom rollers. Consequently, pressure member 17 and cammingface 31 are force transmitting means, and due to the position of thepivot means 5 and 19 of the housing arm and presser arm, respectively,and due to the direction of the camming surface 31, a greater force istransmitted to presser member 9 than is applied to the handle 70 ofhousing arm 7 in the direction of the arrow E. During the downwardmovement of the housing arm 7, pressure member 17 moves in the directionof the arrow G shown in FIG. 2 along the camming surface 31 in theposition shown in FIG. 3 in which pressure member 17 abuts a stop face34 at the end of the camming surface 31 to the position shown in FIG. 1in which pressure member 17 has passed beyond the end of camming surface31 and has entered an arresting recess 33 in presser arm 9. The cammingsurface 31 has such a shape that in the angular sector in the way thetop rollers already abut the bottom rollers, a comparatively greatangular movement of the housing arm 7 is required for a comparativelysmall angular movement of presser arm 9.

By this construction of the force transmitting means 17, 31, the samehave a great reduction ratio, and the camming surface 31 is furtherdesigned so that the ratio of the force transmitting means increasescontinuously during movement of the pressure member 17 in the directionof the arrow until pressure member 17 arrives at the highest point 32 ofthe camming surface which precedes arresting recess 33. In theconstruction of the illustrated embodiment, the pressure member 17,which eflfects the movement of the presser arm 9 by engaging the cammingface 31 of the same, is also used as a locking member for lockinghousing arm 7 and presser arm 9 in the operative position to each other.In order to obtain such locking engagement, the arresting recess 33 isshaped so that presser arm 9 in the locked position is only slightlyupwardly displaced out of the position in which pressure member 17 islocated at the point 32 of camming surface 31. As a result, the lockingengagement can be easily released, since only a slight pull on handle 70in the direction of the arrow F is required for moving pressure member17 from the position of FIG. 1 to the position of FIG. 2. In the fullyopen position of FIG. 3, pressure member 17 abuts stop face 34 which isa continuation of the camming surface 31.

Two compression springs 35 are disposed on opposite sides of presser arm9 in the housing arm portion 12 and abut on the rear wall 36 of thehousing arm portion 12 and have forward ends with inserted pins 37, seeFIG. 4, which abut against a pin 55 extending across and projecting frompresser arm 9. When housing arm 7 is raised to the open position,springs 35 urge presser arm 9 to follow this movement while camming face33 is biassed toward pressure member 17 The position of the pivot axisof housing arm 7 formed by support shaft 5, and the position of thepivot axis of presser arm 9 formed by the pivot pin 21, and also theshape of the camming means 31 and of the arresting recess 33, areselected so that little manual force is required for lowering thehousing arm 7 to the operative position where it is arrested byengagement of pressure member 17 in arresting recess 33. In order toobtain the desired function, the pivot axis of the presser arm is higherthan the pivot axis of the housing arm, considered in relation to thedrawing plane defined by the cooperating top and bottom rollers.Furthermore, the pivot axis of the housing arm 7 is substantiallylocated at the level of the bottom rollers 3, and before the bottomrollers, considered in the drawing direction. The pivot axis of presserarm 9 is located higher than the top rollers 29, particularly in theoperative drawing position shown in FIG. 1, and before the pivot axis ofhousing arm 7 in the drawing direction.

In the position illustrated in FIG. 1, the top roller carrier 4 is inthe drawing position. Presser arm'9 is in an operative position andlocked to housing arm 7 by engagement of pressure member 17 with thearresting recess 33. In this operative position of presser arm 9, thetop rollers 29 engage the respective bottom rollers 3, and are pushedtogether with hearing slide block 25, 26 to a. position in which springs30 in casings 23 are compressed so that pressure is exerted by toprollers 29 on bottom rollers 3.

By turning the handle 15, the angular position of eccentric adjustingmember 14 is varied, so that the annular pressure member 17 may urgepresser arm 9 farther down which would cause further compression ofsprings 30 and increased pressure on the bottom rollers. However, wheneccentric adjusting member 14 is turned in the opposite direction,presser arm 9 is turned by the action of springs 35 in clockwisedirection as viewed in the drawing so that springs 23 expand to hold thetop rollers 29 abutting on bottom rollers 3 while the pressure exertedby springs 30 and top rollers 29 on the bottom rollers 3 is reduced.

The angular adjustment of eccentric member 14 does not have to overcomethe friction of camming surface 31 since the ball bearing 16 permitsturning of eccentric member 14 while friction holds the annular pressuremember 17 in the same angular position.

During a drawing operation, when a roving or sliver is stretched by thecooperating top and bottom rollers, presser arm '9, and moreparticularly guide rail 22 with hearing means 10 thereon, can tilt inthe directions of the arrows B when bottom rollers 3 urge the respectivetop rollers 29 into an aligned position. The bearing seats 26 areconstructed to assure parallel axes of the top and bottom rollers whenpresser arm 9 is tilted. As explained above, tilting and lateralmovement of presser arm 9 is possible due to the construction of thepivot means 21 and the play with which presser arm 9 is mounted on thesame.

vWhen the drawing device is to be opened, housing arm 7 is moved in thedirection of the arrow F. During the movement from the position of FIG.1 to the position of FIG. 2, pressure member 17 moves along a circularpath having its center in the axis of shaft and out of arresting recess33. Since the high point 32 of the camming face is farther spaced fromthe pivot axis defined by shaft 5 then the bottom of arresting recess33, guide rail 21 with hearing means and top rollers 29 is moved a smalldistance further down so that springs 30 are further compressed.Consequently, a certain force has to be applied to handle 70 to unlockhousing arm 7 and presser arm 9. The following portion of the cammingsurface 31 approaches the pivot axis of shaft 5 so that housing arm 7 isturned in clockwise direction by the expanding springs 30 of bearingmeans 10. At the same time, springs 35 urge presser arm 9 to turn inclockwise direction. When housing arm 7 has been turned to a position inwhich pressure member 17 abuts the stop surface 34 of presser arm 9, thesame follows the movement of housing arm 7 due to the action of thesprings 35.

In the event that it is desired to lock the top roller carrier 4 in asecond operative position in which the top rollers 29 are pressed with alesser force against the bottom rollers 3, a second arresting recess 33'is provided in the camming surface 31, as shown in FIG. 3, so thathousing arm 7 can be manually placed in a position in which pressuremember 17 is located in the second arresting recess 33 in which positionthe top rollers abut the bottom rollers, but with a lesser force sinceguide rail 21 is farther spaced from the same than in the firstoperative position shown in FIG. 1.

If it is desired to produce greater or lesser pressure between the toprollers 29 and the bottom rollers 3, the handle 15 is turned to aposition indicated by the indicia 40 so that eccentric adjusting member14 is angularly displaced and correspondingly displaces pressure member17 to increase or decrease the angle between presser arm 9 and housingarm 7.

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types ofdrawing devices differing from the types described above.

While the invention has been illustrated and described as embodied in adrawing device in which a housing arm is manually operated and lockedwith the presser arm carrying the top rollers in a drawing position inwhich the resiliently mounted top rollers abut the bottom rollers at apredetermined pressure, it is not intended to be limited to the detailsshown, since various modifications and structural changes may be madewithout departing in any way from the spirit of the present invention.

What is claimed as new and desired to be protected by Letters Patent isset forth in the appended claims:

1. A drawing device for textile machines, comprising, in combination,supporting means; first bearing means mounted on said supporting means;bottom rollers mounted in said first bearing means; a stationary supportshaft fixedly mounted on said supporting means and having an axisparallel to the axes of said bottom rollers; bracket means fixed to saidsupport shaft; pivot means mounted on said bracket means above saidsupport shaft; presser arm means mounted on said pivot means formovement between an inoperative position and at least one operativeposition, and including second bearing means; top rollers mounted insaid second bearing means, said top rollers cooperating, respectively,with said bottom rollers in said operative position of said presser armmeans; manually operable housing arm means mounted on said support shaftfor pivotal movement about said axis of said sup port shaft between aninoperative position and at least one actuating position; and forcetransmitting means connecting said housing arm means with said presserarm means so that the latter moves to said operative position when saidhousing arm means is moved to said actuating position, said forcetransmitting means having such a ratio that the manual force applied tosaid housing arm means is less than the force transmitted by the same tosaid presser arm means, said force transmitting means including lockingmeans for locking said presser arm means and said housing arm means whenthe same are in said operative and actuating positions, respectively,and being releasable by manual movement of said housing arm means out ofsaid operative position.

2. Drawing device as claimed in claim 1 wherein the axis of said supportshaft is located substantially in a plane defined by the axes of saidbottom rollers, and before said bottom rollers in the drawing direction.

3. A drawing device as claimed in claim 1, wherein said presser armmeans has lateral surfaces, and an opening between said lateral surfaceswidening from the center of said presser arm means toward said lateralsurfaces, said opening having a greater diameter than said pivot means;and wherein said pivot means passes through said opening for mountingsaid presser arm means for pivotal movement about a pivot axis betweensaid positions thereof, and also for tilting and oscillating movementrelative to said pivot axis.

4. Drawing device as claimed in claim 3 wherein said pivot means andopening are positioned to mount said presser arm means for tiltingmovement about an axis which is perpendicular to a plane passing throughthe axis of said bottom rollers when said presser arm means is in saidoperative position, and which is located before said top rollers in thedrawing direction.

5. Drawing device as claimed in claim 1 wherein said force transmittingmeans include a camming surface on said presser arm means.

6. Drawing device as claimed in claim 1 wherein said force transmittingmeans includes a pressure member mounted on one of said arm means, and acamming surface on the other arm means engaged by said pressure memberduring movement of said housing arm means toward said actuating positionso that said presser arm means moves toward said operative position;wherein said camming surface deviates from a circular line concentric tosaid support shaft; and wherein said locking means includes an arrestingrecess in said other arm means at one end of said camming surface andengaged by said pressure member in said actuating position of saidhousing arm means for locking said presser arm means in said operativeposition.

7. Drawing device as claimed in claim 6 and including another arrestingrecess located along said camming surface for engagement by saidpressure member so that said presser arm means is locked in anotheroperative position.

8. Drawing device as claimed in claim 6 wherein said arresting recessdeviates from said circular line and has such a shape that said housingarm means in said actuating position has to be moved beyond saidactuating position for releasing said pressure member from saidarresting recess.

9. A drawing device as claimed in claim 1 wherein said forcetransmitting means includes a pressure member mounted on one of said armmeans, and a camming surface on the other arm means cooperating withsaid pressure member; and wherein said locking means includes a firstarresting recess in said other arm means at one end of said cammingsurface and a second arresting recess located along said cammingsurface, said first and second arresting recesses being engaged by saidpressure member in two different positions, respectively, for lockingsaid presser arm means in two different operative positions.

10. A drawing device for a textile machine comprising a supportingstructure including supporting means, first bearing means mounted onsaid supporting means, and a stationary support shaft fixedly mounted onsaid supporting means; pivot means mounted on said supporting structurespaced from said support shaft; bottom rollers mounted in said firstbearing means; presser arm means mounted on said pivot means formovement between an inoperative position and at least one operativeposition, and including second bearing means; top rollers mounted insaid second bearing means, said top rollers cooperating, respectively,with said bottom rollers in said operative position of said presser armmeans; manually operable housing arm means mounted on said support shaftfor pivotal movement between an inoperative position and at least oneactuating position; and force transmitting means connecting said housingarm means with said presser arm means so that the latter moves to saidoperative position when said housing arm means is moved to saidactuating position, said force transmitting means having such a ratiothat the manual force applied to said housing arm means is less than theforce transmitted by the same to said presser arm means, said forcetransmitting means including locking means for locking said presser armmeans and said housing arm means when the same are in said operative andactuating positions, respectively, and being releasable by manualmovement of said housing arm means out of said operative position, saidlocking means including a part of said force transmitting means mountedon one of said arm means and an arresting recess formed in the other ofsaid arm means and engaged by said part when said presser arm means andsaid housing arm means are in said operative and actuating positions.

11. Drawing device as claimed in claim 10 wherein said part is mountedon said housing arm means and said arresting recess is formed in saidpresser arm means; and wherein said part engages said arresting recesswhen said housing arm means is moved to said actuating position wherebysaid arm means are locked to each other and against movement to saidinoperative positions.

12. Drawing device as claimed in claim 10 wherein said part is apressure member, and wherein said other arm means has a camming surfaceengaged by said pressure member; wherein said camming surface ends insaid arresting recess; and wherein the contour of said camming surfaceis located in a plane perpendicular to the drafting plane defined bysaid bottom rollers.

13. Drawing device as claimed in claim 12 wherein said pressure memberis mounted on said housing arm means; and wherein said presser arm meanshas said camming surface.

14. Drawing device as claimed in claim 13 wherein said pressure memberis mounted on said housing arm means for rotation about an axis.

15. Drawing device as claimed in claim 13 wherein said forcetransmitting means include mounting means for adjustably mounting saidpressure member on said housing arm means.

16. Drawing device as claimed in claim 15 wherein said mounting meansinclude an adjusting member having a circular periphery carrying saidpressure member which is annular; said adjusting member being turnableabout an axis eccentric to the center of said circular periphery.

17. Drawing device as claimed in claim 16 wherein eccentric adjustingmember has a shaft mounted in said housing arm means for turningmovement about said axis and projecting out of the same; operating meanssecured to said shaft outside of said housing arm means for turning saidadjusting member; and indicia means on said housing arm means forindicating the position of said operating means and of said eccentricadjusting member, and thereby the position of said pressure member.

18. Drawing device as claimed in claim 17 wherein said operating meansis a manually operable member secured to said shaft and having a portioncooperating with said indicia means.

19. Drawing device as claimed in claim 15 wherein said mounting meansincludes a self aligning roller bearing surrounded by said pressuremember so that said pressure member can tilt in said plane.

20. Drawing device as claimed in claim 10 wherein said housing arm meanshas a U-shaped cross section open downward toward said top rollers;wherein said presser arm means in said operative position is located insaid U-shaped cross section of said housing arm means in said actuatingposition and projects out of said housing arm means and toward saidbottom rollers in said inoperative positions.

21. A drawing device for a textile machine comprising a supportingstructure including supporting means, first bearing means mounted onsaid supporting means, and a stationary support shaft fixedly mounted onsaid supporting means; pivot means mounted on said supporting structurespaced from said support shaft; bottom rollers mounted in said firstbearing means; presser arm means mounted on said pivot means formovement between an inoperative position and at least one operativeposition, and including a straight guide rail, second bearing meansmounted on said guide rail for longitudinal movement between adjustedpositions cooperating with said bottom rollers, and means for securingsaid second bearing means in said adjusted positions to said guide rail;top rollers mounted in said second bearing means, said top rollerscooperating, respectively, with said bottom rollers in said operativeposition of said presser arm means; manually operable housing arm meansmounted on said support shaft for pivotal movement between aninoperative position and at least one actuating position; and forcetransmitting means connecting said housing arm means with said presserarm means so that the latter moves to said operative position when saidhousing arm means is moved to said actuating position, said forcetransmitting means having such a ratio that the manual force applied tosaid housing arm means is less than the force transmitted by the same tosaid presser arm means, said force transmitting means including lockingmeans for locking said presser arm means and said housing arm means whenthe same are in said operative and actuating positions, respectively,and being releasable by manual movement of said housing arm means out ofsaid operative position.

22. Drawing device as claimed in claim 21 wherein each said secondbearing means includes a guide way through which said guide rail passes.

23. Drawing device as claimed in claim 21 wherein each said secondbearing means comprises a casing mounted on said guide rail, a slideblock supported in said casing for movement transverse to said guiderail, and supporting a top roller, and spring means in said casingabutting the same and said slide block and biasing the same and said toproller toward an end position so that in said operative position of saidpresser arm means, said top rollers resiliently abut said bottomrollers.

24. A drawing device for textile machines, comprising, in combination, asupporting structure including supporting means, first bearing meansmounted on said supporting means, and a stationary support shaft fixedlymounted on said supporting means; pivot means mounted on said supportingstructure spaced from said support shaft; bottom rollers mounted in saidfirst bearing means; presser arm means mounted on said pivot means formovement between an inoperative position and at least one operativeposition, and including second bearing means; top rollers mounted insaid second bearing means, said top rollers cooperating, respectively,with said bottom rollers in said operative position of said presser armmeans; manually operable housing arm means mounted on said support shaftfor pivotal movement between an inoperative positionand at least oneactuating position; and force transm ttmg means connecting said housingarm means with said presser arm means so that the latter moves to saidoperative position when said housing arm means is moved to saidactuating position, said force transmitting means mcludmg a pressuremember mounted on one of said arm means, and a camming surface on theother arm means engaged by said pressure member during movement of saidhousing arm means toward said actuating position so that said presserarm means is moved toward said operatlve position, said camming surfacebeing located between sa d second bearing means and said pivot means anddeviatmg from a circular line concentric with said support shaft, saidforce transmitting means having such a ratio that the manual forceapplied to said housing arm means is less than the force transmitted bythe same to said presser arm means, said force transmitting meansincludmg locking means for locking said presser arm means and saidhousing arm means when the same are in said operative and actuatingpositions, respectively, and being releasable by manual movement of saidhousing arm means out of said operative position.

25. Drawing device as claimed in claim 24 wherein said support shaft islocated below said camming surface; wherein said pressure member ismounted on said housing arm means, and said camming surface is locatedon said presser arm means.

26. A drawing device as claimed in claim 24 wherein said camming surfacehas such a contour that the ratio of force transmission between saidhousing arm means and said presser arm means continuously increasesduring movement of said presser member along said camming surface untilsaid pressure arm means and housing arm means are locked by said lockingmeans.

27. A drawing device for a textile machine, comprising a supportingstructure including supporting means, first bearing means mounted onsaid supporting means, and a stationary support shaft fixedly mounted onsaid supporting means; pivot means mounted on said supporting structurespaced from said support shaft; bottom rollers mounted in said firstbearing means; presser arm means mounted on said pivot means formovement between an inoperative position and at least one operativeposition, and including second bearing "means; top rollers mounted insaid second bearing means, said top rollers cooperating, respectively,with said bottom rollers in said operative position of said presser armmeans; manually operable housing arm means mounted on said support shaftfor pivotal movement between an inoperative position and at least oneactuating position; biassing means for urging said presser arm means tosaid inoperative position thereof so that said presser arm means followssaid housing arm means when the same is manually moved to saidinoperative position thereof; and force transmitting means connectingsaid housing arm means with said presser arm means so that the lattermoves to said operative position when said housing arm means is moved tosaid actuating position, said force transmitting means having such aratio that the manual force applied to said housing arm means is lessthan the force transmitted by the same to said presser arm means, saidforce transmitting means including locking means for locking saidpresser arm means and said housing arm means when the same are in saidoperative and actuating positions, respectively, and being releasable bymanual movement of said housing arm means out of said operativeposition.

28. Drawing device as claimed in claim 27 wherein said biassing meansinclude compression spring means abutting said housing arm means andsaid presser arm means.

29. A drawing device for a textile machine comprising a supportingstructure including supporting means, first bearing means mounted onsaid supporting means, and a stationary support shaft fixedly mounted onsaid supporting means; pivot means mounted on said supporting structureabove said support shaft; bottom rollers mounted in said first bearingmeans; presser arm means mounted on said pivot means for movementbetween an inoperative position and at least one operative position, andincluding second bearing means; top rollers mounted in said secondbearing means, said top rollers cooperating, respectively, with saidbottom rollers in said operative position of said pressure arm means;said pivot means being located higher than said bottom rollers and toprollers in said operative position of said pressure arm means, andbefore said support shaft in said drawing direction; manually operablehousing arm means mounted on said support shaft for pivotal movementbetween an inoperative position and at least one actuating position; andforce transmitting means connecting said housing arm means with saidpresser arm means so that the latter moves to said operative positionwhen said housing arm means is moved to said actuating position, saidforce transmitting means having such a ratio that the manual forceapplied to said housing arm means is less than the force transmitted bythe same to said presser arm means, said force transmitting meansincluding locking means for locking said presser arm means and saidhousing arm means when the same are in said operative and actuatingpositions, respectively, and being releasable by manual time position.

13 movement of said housing arm means out of said opera- ReferencesCited UNITED STATES PATENTS 12/1959 Dausch 19267 5 1/1960 Schrotz 19-2827/1962 Gerber 19295 10/1965 Schmid et a1. 19282 3/1967 Stahlecker et a1.19267 10 FOREIGN PATENTS 12/1959 Great Britain 19-281 14 OTHERREFERENCES German Printed Application, Dausch, No. 1,135,350, Aug. 23,1962.

German Printed Application, Schrotz, No. 1,071,548, Dec. 17, 1959.

DORSEY NEWTON, Primary Examiner US. Cl. X.R.

